Type-writing machine.



PATENTED APR. 16, 1907.y

G. H. SMITH. TYPE WRITING MACHINE.

ArrLmATloN Hman JAN. 24. 1905.

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PATENTED APR. 16, 1901. G. H. SMITH.

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TYPE WRITING MACHINE. APPLIOATIQN FILED JAN. 24. 1905.

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TYPE WRITING MACH-INE. APPLIOATION FILED JAN. 24. 1905.

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stroke of akeychines, and more especially Io' OFFICE.

. GEORGE H.A ,SllUTH^, 0F `EVANS'IQN,` ILLINOIS, ASSIGNOR TO DEN SMORE;

TYPEwRITER-...conr .non or Naw YORK.

Y, lojF sYnAoUsE,

NEW YORK, A CORPORA- TYPE-WHITING MACHINE.

-Be Ait known ythat I, GEoRGE H. SMITH, a

citizen ofthe United States, and a resident of Evanston, in the-'count yof Cook and State of of which the following is a specification.

" My invention relates to type-Writing mafeed mechanism of suchmachines.- A

The' main'. object of theinvention-isto'projusted to feed the carriageelther on the downmechanism as it the u-pstroke ofa key-lever.

Of the structure shown in Fig. 3 as it 'ap ears when viewed fromtheleft-hand vside- A 49 particularly pointed out in spending to Fig.

lin Fig.- 7 as they section, respectively,

vlde an elficient and comparatively simple escaper'nent mechanism whichmay be adjstroke or on the upstroke of a key-lever.4

-, `To the above ends the invention consists of the universal bar' andthe features of construction, combinations of'devices, andarrangementsof parts to be hereinafter more specically.

claims..

In the accompanying drawings, Figure] .is a rear elevation, partly insection, ofso much of a type-.writing machine as is necessary -toillustrate my invention. Fig. 2 is a sectional "viewtaken on va lanerepresented' by the line :c z. in Fig. 1. ig: 3 is-an-enlar ed detailfront elevation, ar'tly in section, oaporton ofthe structureillustrating' the carria .e-feed appears when 4setfto eed. on Fig.4 4isja view i0. 5 is a view 'of Fig. s 100km at ,from-therighe hand side.Fig. 6' is a view of the parts'. shown in Fig. 5 as 'they appear whenakeylever is depressed.

4 5, but with the parts set to. cause the feed ofthe carriage on thedownstroke.- .'Fig. 8 is a view ofthe parts shown appear when akey-lever is depressed. Figs 9, 10,y and 11 are detail viewsinperspective, top plan, .and vertical 'of' the dog members o. theescapement. Figs 12 and: 1.3.are detail views of other parts of theescapeme-nt mech- Specieation of Letters Patent. Application filed .Imm24. 19de. serial No. 242,472.

to' the :carriagearranged series supporte A second object 1ste provldeanimproved .rammed April -1e, 1907.

of the In the drawings, 1 indicates the frame a series ofkey-leversflilmachine; 2, one of provided with a restoring-spring 4 anda keycap .5.f' Integral with each key-lever is' a hooklike member 6.,which is adapted to coact vwith a universal bar'7, the latter beingdescribed, vand f the concluding Fig. 7 1s a view corre# lever insteadAofon the up-v thicker4 than the central ears are perfcrated,and theperforation in platen 16, is connected byv links 17 to a carriage-truck18. The `'platen-carrier is provided with va roller 19, which runs -inagroove formed-in the shiftrail '20, and the carriagetruck is rovidedwith rollers 21, which engage wit i' grooves` in the xed Way or trackV22 at the rear of the machine. Mounted on theI carriage-truck is afeed-rack 23, which normallyv engages with a pinion 24, secured to theforward end 'track 22, and a rear bearing 27 at the top of a bracket 28,which latter is vsecured to th frame by screws 29. Secured to the rearenf' of the 4shaft 25 is a circular escapement-rack Aor esca ement-wheel30, 'having teeth 31.

The4 racket 28 is formed at each side with receives afscrew-p'ivot 33providedwith a checknut 34.

the screw-pi v ot 4ote'd carriage called a dog-rockeror carrier. 36,which projects vertically upward from the left-hand end of the shaftportion 35 as viewed in Fig. 3. ,The 'Bhd of the shaft portion-35ofthedog-rocker is provided wit '1 hardened-metal cups .3 7 which'ci'oact with the pivots 83.` Theto of thedog-rockerterminates inthreeears tile two outer 'ears 38v being somewhat ear 39.

support the 'shaft 35 ofa 'pivthe forward ear, Fig. 11, is tapped forthe recoaxially pivoted'or mounted two dog members crumedn a fixed'rod3, each key-lever being "a rearwardly-projecting'ear 32, Fig. 1,whichfeejding element, commonlyTv provided at its' ends and near itscenter'with.. horizontal arms S,

465 or.wireg'10=connects the of a shaft 25, the latter llav- 'i ying aforward bearing 26, integral .with ,the

4The inner or pivot ends of IOO The threews ceptiony of a pivot-screw40, upon which are 11 and 4 2, which .arel separated'l by the,"

` portion of the dog, and the rear dog member 1s provided with a similartail 44. The working face of the forward dog is rounded off' from rearto front at 45, Fig. 9, to conform to the arc in which-it moves aboutthe pivot 33 ofthe dog-rocker or carrier, and the working Drivendownward 47, which serves as a guide for 4the upper portion ofavertically-di'sposed contractile' spring 48, which -is'seated 1n awell-,like depression 49 in the top of the dog-rocker, Fig.

member 55, the lower portion.whereo f is, Aformed with -a vrectangularopening 56, which 3. .A pin 5()- in the rear dog serves to guide asimilarly-disposed contr ctile `spring 51.-

Close to its junction wit theshaft portion the dog-rocker 36 isperforated to receive a short pivot-pin 52, Figs. '3 and 13, which hassquared end portions 53 and 54.' Mounted on the left-hand end ofthepivotend 52' as viewed-in Fig. 3 is a locking or switch fits over the squaredend 53 Vof the pivot-pin 52. A screw 5 7 screws into the end of the.pivot-pin; serving to lretain the switch 'in' place `Above the opening56 the looking or lswitch member is formed with an elongated slot 58,through which passes ,a screw '59,

which screws into the side of the dog-rocker. yThe .upper (portion ofthe switch is cut away or depresse centrally at 6 0, -a-nd the sides ofthe depression'are sharpened or beveled at their edges, thereby formingbeveled fingers 61 and 62, which oop'erate with the tails of the dogmembers. l At the rear and near the top the switch is provided with afinger-piece 63. -viewed in Figs. 3 and 13 supports a stop "member 64,the lower portion of which is formedwitha rectangular o ening 65, inwhich the squared end 54 of t 1e pin 52 fits, the stop-member beingsecured in place by screw 66,V which screws into the end of thepivot-pin 52. -The upper portion of the stop member 64 terminates in atop 67, which is shaped to cooperate with Vthe underside of `the bodyportions of the dog members. The shaft 35 of the' dog-rockeri's-forI-ned centrally of its length with a forwardly-projectin Ashortarm orlug-'68 and near its left-han end as viewed in witha'do'wnwardlyprojecting'lug 69.

Pivotallv connected with .the forward arm4 68 of the dog-rocker is` theupper portion 70' 'of a connecting-rod 71. The upper `end.of the pggtion7'() 1s' liattened at 72 and is provided with a pin73, which enters aihole in the end of the arm 68` and is retained in position by a 4fiatlockingspring 74,-w1iich is u slot or nick 82 inthe arm 69. 83, Figs. 2,5, and12, is `threaded upon tl1e85 movement of the dog-rocker. .mountedlocking-pawl 88 prevents-baok- 95 The right-hand end ofthe pivot 52 'aslower end of thepor'tion75 is provided with a pivot-pin 77 at rightangles to the body portion ofthe rod, 'and the ends of the pivot-pin 77engage with rounded cut-aways or slots 7 5 78, formed in the undersideof the two cenface of the' rear dog is' similarly rounded olf fromfront to rear at 46.

throughthe .top of the forward dog is a pin dog-rocker is formed with ahole to receive an adjusting-screw 79, the threaded shank -of 8c Whichpasses freely through the hole. The inner face of the head 80 of saidscrew is formed with lugs 81, Fig.. 12, which coperate wi th a -A nutmember screw- 79, and suitably' secured to 4the nut i member, asbysoldering, is the rear end of an expansible coiled spring 84, which'surrounds the screw 79 and has its forward end secured `to a Z-sh'apedarm 85, which is fixedto the 9o frame of the machine by a screw 86. u

An adjustable stop 87 of the usual or any -preferred constructionlimits: the forward A springward rotation of the esoapement-wheel whenthe carriage V is released. .-An adjustable screw-stop 89, supported inan arm 90, which is secured to the framework of the machine by,l

a screw 91, serves to limit the upwardmovei co l ment of the universalbar 7 .A The escapement mechanism is protected by a U-shaped shield 92,secured 'tothe framework of the Y machine.

When arranged-for the ordinary feed'-- 5 that is, for'feeding thecarriage on the up-` 'stroke of the key-levers-fthe normalpos'itionofthe parts of the'escapement' mechanism will be that shown in Figs. 3,4, and'5. When the pky-cap 5 is adequately depressed, the 11o type-bar14 will be actuated to jthe printing position in a manner wellunderstood, and the Y ook portion 6 of the key-lever 2 contacting. withthe universal bar 7 `will swing the latter downwardlyaboutits pivoty 9,causing the 'connecting-'rod71 to movein a downward direction andswinging thedog-rocker forward of its pivot to the position shown inFig. 6. As soonas the forward dog 41,

-whioh'in this oase is 'the' feed-dog, is freed 12ofrom the tooth 3'1 ofthe escapement-wheel it swings'upwardly about its pivot 40 under theinfluence of'its sprin 48 into thepath of the next succeeding toot 31 ofthe esoapementwheel, so that as the fparts return to normal 1 z 5position under the in uence of the spring 84 andas soon as the dog 42has moved backwardout of the pat i of the esoapement- -wheelth latterunder the influence of the,J usual 'carriage-splring,- (not'shmwgl which13o.

acts upon the escapementwheel through shaft 25, pinion 24, rack 23, and.carriagetruck 18, will overcome the influence of the ited by the contactof the rear wall of the slot 58 with the body of -the screw 59, and whenthe shifter has been moved to this forward position by means of thefingerpiece 63 it is maintained therein by the frictional contactbetween-the under side of the head of the screw 59 and the face of theshifter.

. During this forward movement of the shifterv upon the dog-rocker theedge of the bevele'd finger 61 'of the former passes between-the tail ofthe dog 42 and the face of the dogrocker and gradually pushingthetailfoutward depresses the dog against the influence the positionshown in Fig. 8.

lof its spring 51 until saidv dog contacts with the top4 of thedog-rocker between the centra] ear 39 and the rear ear 38.

The shift member or shifter 55 being mounted upon the squared end 58 ofthe l pivot-pin 52, the latter is` caused to rotate `common axis of thedogs.

with' the shifter under the influence of the.

force exerted against the finger-piece 63., and as the stop member 64 ismounted upon the opp'osite'squared end 54 of the pivot-pin 52 the saidstop member 64 will likewise participate in the rotary movement oftheshifter, so that when the latter has reached thelimit of its forwardmovement the top 67 ofthe stop member will be underneath the dog 41.-Generall stated, the stopping element and thelo'ckmg element of thecombined switchV and stop arepositioned simultaneously to act one uponeach` dog 'at opposite sides'of the As clearly a. pearsfrom aninspection-of Figs; and6, tffe topA 67. of the` stop member is somewhathigher than that portion of the top of the dogrocker. which is betweenthe ears 38 and 39, so that in normal position when the forward dog lisin contact with the top 67 o f the stop member and the. rear deg is incontact with that portion of Athe top of the dog-rocker l' ..wh1ch isbetween the rear ear 38 and the central ear 39 the working face'of theforward dog islslivhtly higher than or in advance of the workingface ofthe -rear dog. When, therefore, the dog-rocker is rotated forwardly fromnormal position, an easy andcertain entrance of the rear dog into thepath' fected, and, this result isass'ured even thou h the forward dogmay have become -slight y worn 1n use.

When it is desired to feed the carriage during the downward movement ofa key-lever, or, in other words, when it is desired to usetherebylcausin g thecarriage to move forward the reverse feed, theshifter 55 is vpulled rearwardly by means of the flnger-piece 63 untilthe forward'wall of the slot 58 contacts with the body of the screw'59.DurinfJr this rearward rotary movement of the shifter upon thedog-rocker the beveled edged iinger 61 passes out from between thetail44'ofthe dog 42 and the face of the dog-rocker, allowing the dog 42 to.be rotated'l upward under the influence of its spring 51. At the same'time the beveled finger 62 passes between the 'tail 43 and the face ofthe dog-'rocker,rotat ing the dog 41 downward against the infiuence ofits spring 48, until the under face of said dog contacts with the top ofthe dog* rocker between the ears' 38 and 39. The stop member 64 hasmoved rearwardly with the shifter 55, so that the to 67 of said stopmember will now serve' to imit the downwa'rd movement of the dog 42. Theparts will now be in a position shown in Fig. 7.. 'If

now a key-lever be adequately depressed,

the dog-rocker will be rotated forwardlyto During the' forward movementof the dog-rocker the Workin face-of the dog 41, which is now'theholding\ of the4 escapement-wheel, and when this occurs the dogV 42,which is now the feed-dog, having] at the same time moved into .theplane of the escapementewheel between the dog, moves out of the pathofthe tee'th`31 nexttwo succeedingteeth will'be depressed l against the.top 67 of the stop-memberl 64 under the induence of thecarriagefspring,

one space. As the dog-rocker returns from the forward position shown iln8 to the -normal position shown in Fig.- 7, mainly under the infiuenceof the spring 84, theworking face ofthe dog 41 effectsan easy'entranceinto the path of the teeth of the esca ementewheel, since the rear-.dog42, which nowrests upon the top 67 of the stop member,

isin advance. of or -in .somewhat a higher planethan the forward'dog 41.

It will be noted that I have provided a combined shifter and stopmember` exceed- TOO ingly simple Vin construction and adjustment-f s aswell' as effective in operation. .W hen it is employed, all that'isrequired in orderfto changeA from the ordinary to t'he reverse' feed :orvice versa' is to actuate the shift'member orshifter back andfinger-piece 63.

In orderto increase or diminish the tension of the expansible'dogrockervspring'84,vit is forth by means 'of' the only necessary Vto* turn thescrew 79 in lor out by the aid of a screw-driver or other suitablemeans. This will cause the nut 83 to move backward or forward along thescrew 7,9, thereby increasing ordimini'shing' the ten- [sion ofthedog-'rockerspring At everyhalfturnzof the`sclew79 the lu s 81 .on theinner face 'of'itsV head"'hgage wit theisjlot o r nick@ 82 in thearms-or lugs 69, thereby locking the .which the pivot 77 is screw and.preventing accidental rotation thercol'.- The device is asimple one`and provides a readily accessible and operable means for varying thedog-rocker tension to a slight or greater degree.

The connection 71 between-the dog-,rocker and the universal bar may be'readily disipped theentire connection 71 returned toits ,place .thespecific some parts ofthe invention may bel'used,A

' rack, each of said dogs tension; `a sprlng coactlng with,v each dog,.-

- rack each of said dogs llation with the I .2. In a type-writingmachine, the combi 1n the mac ne.

' do not of course desire tobe limited 'fto construction and of parts asI have described them.

Various changes in these .and other respects may be effected withoutdeparting from the spirit or'scope of my invention-` and withoutemploying other parts.

Parts of the machine have been omitted from the drawings', and otherparts shown therein have not been described in detail. ese various partscomprise the subjectof. other applications -for Letters Patmatter ent.

What I claim as new and desire to. secure by Letters Patent, isA` l'.Ina type-writing machine, the-combination of an -escape1nent-rack; adog-carrier a pair of dogs'pivoted on said carrier and adapted'tocooperate with said escapementrack, each of said dogs having a tall orextension and a shift member mounted upon the dog -carr1er and adaptedto coact'with the tail of either d-'og to hold the dog' in a iixed re'dog-carrier. A

nation of an escapement-rack a `og-carrie1'; a palr of dogs pivoted onsald carrier and adapted to cooperate with said escapementeither dogtoovercome the force of its sprin In a typewriting. machine, the comb1-nation of an escapement-rack d:- a dog-carrier', :i air of dogs -pivotedon said carrier and a apted to cooperate with said escapementhaving atail or ox-4 tension; a spring coacting with each dog;

and a shift member mounted upon 'the dogi carrier and adapted to coactwith thetail of elther dog to overcome the force of its spring apair-of-dogs pivoted in the To accomplishl the head of the in'73.

68, -after down tight and- Aand 'adapted spring arrangement v tocoperate wlth either i rocker.

-with sald les'ca-p'ement-vWheel Amounted upon to be interposed betweenthe face of the doge` fixed relation with said dog-rocker. In atype-Writing machine, the combl- 'having av tail or ex nationoi anescape'lnent-rack; a

and to hold the t V1e dog-carrier.

In a type-writing nation of anescapement-rack a dog-carrier; top oi saiddo dog a iixcd refation'with carrier and adapted to co escapement-rao k,each of said dogs ha-vlng a tall or extension 5 .a contractile springadapted' y ed to cooperate with each of said dogs to swing it away fromthe dog-carrie1';. s ift member mounted upon the dog-'carrier andadapted -to c oaot with the tail of either of said dogs to lovercome theforce' of its conla'tion with the dog-carrier.

' In a type-writing machine, the combierate with sind machine, thecombitractlle' spring and hold the dog in a xed^rcl' nationo anescapement-wheel; a dog-rocker pivoted to rock 'transversely ofsaidwheel a pair of'dogs pivoted uponsaid dog-rocker to ooperate with saidescape Inen't-wheel-at the side thereof; a contractile coperatingwitheach dog and constantly tending 'to swing about its pivot vand ashift member adapted dog to overcome the force ofit'sV contractilespringend` to maintain the dog in a fixed relation with the dog '6. Inatype-writing machine', the combination ofan escapement-wh'eel adog-rocker pivoted to rock transversely of said 'escapement-wheel a pairof dogs pivoted in thetop'l rof Said d ,g-rockerv and `adapted toooperate at the side thereof, eachv'of said dogs having a .tail or eX-tension; acontractile springadapted to co` operate 'with each dog memberto swin it upward about itspivot 3 vand a shift men-lier Asaid-'dog-rocker and adapted rocker and the 1 the force ofthecontractile spring as associ dog 1n a ated with said vdog and to holdsaid nation of an escapement-rack 3 a dog-carrier; a pair of dogsplvot'edon said carrier and adapted to coperateiwith said 'escapementfying a tail or .eX-

rack, each of said dogs ha tension; ashift member mounted upon the.`

o -oarrier .and adapted to coact with the tai of' either dogto -hold thedog in axed relation with the'dogcarrier anda stopmem ber adapted to beslmultane'ousl)T positioned to limit the movement of the other dog. j 8.In a type-writing machine, thecombidog-carrierv a pair odogs pivoted onsaid carrier and ad. pted tolcoperate with said esoapementrack, eachv ofsaid dogs tension and a combined shift and stop member which is mountedupon tlie'dog-ca.1rier and eopcrates with the dogs, one part of saidmember beingr vadailited tocoact with thetail `4 I of either dog Ato hod thedog in a fixed relahaving` a tail or cX- said dog upward reo 10sither dog to overcome IIO l1.o tensiong`means coactingr wit tion withthe dog-carrier while at the same time another part of said member ispositioned to limit the movement of the other dog. 9. ln a type-writingmachine, the combination of anI escapementfrack; a dog-carrier; a pairof dogs pivoted on said carrier and adaptedto cooperate with saidescapementrack, eachof said dogs havin r the tail of either dog to lockthe dogagainst" movement; andmeans combined. 4with said first-namedincansand coactin'g-with the body portion of 7:the unlocked dog forsimultaneously limiting.

1 5 the movement of the'unlocked dog in one direction, so that theworking face of said unlocked dog will at vall times be in advance ofthe working face ofthe locked dog.

10.. Ina typefwriting machine., the combin zo nation'of anescapementerack; a dogwarrier'; a .pair of ,dogspivoted on said carrier`and adapted tfocooperate with said escapernentrack, each "of said dogshavin a tail or extension; aspring coacting Wit each dog; a

z shift member mounted on thedog-carrier and adapted to enact with thetailof either dog to overcome the l'force .ofits spring and to lock andastop member c ombined'wit, Vsaid v3o .shift/member and adaptedtollimitlthe 11112;?-

og soi at t e-Wor g'- ezlccled 'dog at all pivoted -to rock transverselyof s'aidwheel g a..

pair of dogs pivoted onsaid dog-rocker and adapted vto cooperate withsaid esca ement- 4o `Wheelat-.the side thereof,4 a-cotract e spring-coperating'with each'do'g, each spring con stantly tending to swing'its'. dog, upward about its pivot; ashft meinberjadapted to cperate witheither dog to over-come the 45 force'o its contractile sprl f 'andtolock the )do "in aiXed relation wit the dog-rocker;

' an a stop-member Vcombined With-,said shift meinber and ada tedtocoperate with the unlocked dog to imit.; the downward move- 5o ment ofsaid dog,-the combined shift and stop members serving, to lmaintaintheWorking.

"face-'of the unlocked dog above the -face othelocked log at all times.A

5 5 nation of an escapement-wheel adog-rocker plvoted to vibrate jtransversely. of' saidI escapement-wheel; a

' to'contact wlth the top-of :the dog-.rop

ears inthe top ofsai dog-rocker and.. apte'd er .be-

6o"tween the ears; means .forlockiifig-eithieI ofj.

said dogs in contact with theitop ..o,the'" og,- rocker.; ,and means for4ato the :movement of the unlocked dogl ,eforejitisoontacts with the topof the do rocker,' sdtha't' the working face of than ockeddog'will'be ina tail or ex.

.one dog on oneside oi its axis to lock said nately uponthe willbe inadvance 2f In a type-writmgmachi fe, the celebs-jj, 'fdg carrier- -at'one end 'and providedat the 4um other-end with a transversej pivotpiihcll4 ajir'ofdogspiveted in; Vengages witl1eutawaysi11.the un advance.of the Working face of thc'locked dog at all times.

' 13. In a type-writing machine, the conibinationof avertically-disposed escapementwheel; a dog-rocker pivoted to vibratetransversely of said wheel; a pair' of dogs pivoted coaxially in saiddog-rocker and ada ted *to cooperate with said esca ement-whee at theside thereof; =a contracti e spring cooperating with each dog andconstantly tending to swing the dogr upward 'about its piv0t;a` combinedshift and sto member pivoted in said dogaockor andad)apted tocoact with'dog-from movement and at the saine til'ne to 8o cooperate with the otherdog-at the opposite side ol its axis toliniit the movement of said dog;and n'ianually'foperated means for swing- 'said-.i'nelnberabout itspivot to cause its' locking and stopping elements to actalterogs; 4

14. In a type-writing machine, and in= an escapement-mechanisin, thecombination of an escapement-track; a dog-carrierpi`voted to vibratetransversely of said rack;'anda-9o pair of dogs mountednponsaidcarrierand 'adapted to cooperate withV said escapernentg rack, theworking faces', of said'do s shaped to conform substantially' to -te'arc in which theymove labout the .pivot of thedogi l carrier. 15; In atyp-Writingi-inachine and-in an escapement mechanism, the combination Aof an esc'ape'lnent#wheel; "a dog'Trocker p iveted to vibratetransversely'of said escapement leg.

- @ses with' @he teeth 'of said -esicapemen heuathe pivot saidcarmageffeeding element at yone-.end and provided at thejotlierend-withfa pivot ortion which '.pivotally lengages with. the. undhr sideofv -said universal bar. A l .2171-111 a type' writing machine, 4thecombi'- nation of a universal bar; means for actuater side-'ofi saiduniversal bar.

18. In a type-writing machine, the combination of a universal bar, meansfor actuating r z 5 the same, a feeddog aar'rier,- a. two-piece,4longitudinallyadjustable zzconnecti U-rod detachabl;r Aconnected withsaid fee dog car-' rierat one end 'and provided at'the other end with -al'titerisverse pivotfpin which engages 13o with cnt-,aways in the underside lof said universal bar, the construct-ion bein the connecting-rodmay be rcadiIy removed and adjusted. ,f

19. In a type-writing machine, the combination of a plvoted dog-rockerhavin ade pending arm; means for actuating said dogrocker; an'expansible springl having one end connected with a fixed part'of'- themachine -and having a nut' member secured in its other end; and atension-adjusting screw passing ythrough t depending arm of saiddogrocker and e waging with the'nut in the end of said spri that Whenthe dog-rocker is actuatec from.

-normal position the spring isexpanded and thereafter upon contractingserves to restore the doO-rocper'to normal position.I 20. In a' ype-Writing machine, the combination of a ldo,'grocker having a perforateddepending ann; meansfcr actuating said dogrocker, an expans'lble springconnected at one end with a fixed part of the machine; a

nut member-connected with vsaid spring; al

headed tension adjusting' screw passing through thev erforation-in thedepending arinof said og-rocker -and engaging with said nut member g andmeans accidental rotation of 'said screw.

2.1'. In a type-Writing machine, the comhil 'nation'ofadog-rocker havinga perforated de# lpending arm j means for actuating said dog` roe'ker;an expansible 'spring connected at such that lheaded tension adjustingthe arrangen'ient bein such` for preventing .one end witha fixed 'partofthe machine; a

nutmember connected with said spring,- a

through. the erforation 1n the dependin arm ci said og-rocker and engaingwit said nutmember the inner face o the head of said screw being.formed with lugs or projections which engage with depressions or nicksin the depending arm of the dog-rocker,

the construction serving to prevent the accidental rotation of said.screw.

V22. In a type-Writing machine, the combination Vof a pivotedclog-rocker; means for actuati-Jigy the same; a coiled expansible springhaving one end connected with a' fixed lpart oi the machine; anutinember connected 'withsald 'sprlng and Within i ts coils; a tension-4adjusting screw coperating with said nut member and adapted to passthrough said adjustably engaging-with GEORGnH. sMrrI-i. Witnesses CHAs.HOHER,-

HAZEL GRANT BOYD.

